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In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

Because the information in groupware system has Characteristic of complex, various, large quantity, non-structure or structure complex, close relativity of information, etc, and the traditional relational database can hardly handle these complex and various information. This paper aims at the problems that groupware system meets in application, put forward the research on groupware system based on object-oriented database management system.

由于群件系统中所处理的信息具有复杂、多样、量大、非结构化或结构复杂以及信息间的相关性紧密等特征，而传统的关系型数据库很难处理这些复杂多样的信息，因此，本文针对群件系统对数据库的应用需求，提出了基于面向对象数据库管理系统的群件系统的研究。

It was simply introduced of composing and work characteristic of supervise and control system of the central air condition.

所以，对中央空调系统的有效控制及提供标准的通信接口是节能和系统集成的关键所在。

According to the temperature control characteristic of the carbonyl compound mode evaluation device,the paper presents the design of system hardware and software,studies of control algorithm in combination with PID,pure delay and fuzzy control technology.

针对羰基合成反应装置中温度控制的特点，设计了温控器的硬件和软件部分；研究了与之相适应的控制算法，提出将模糊控制、PID控制及纯滞后控制算法有机地结合起来，使温控器在具有PID控制器动态跟踪品质和稳态精度的基础上，进一步实现控制的自适应性，发挥模糊控制鲁棒性强、动态响应好、上升时间快、超调小的特点。

The structural characteristic of compound combustion engine is modification of basic diesel engines into alcohol-injection engines.

这种燃烧利用醇的高汽化潜热和含氧特性，达到同时降低柴油机碳烟和NO_x排放的目的。

It is found that under natural conditions, language input is characteristic of spontaneity and comprehensibility and it does not follow the natural developmental order.

指出在自然条件下，语料输入具有明显的自发性、理解性和无序性特征。

JPEG2000 is a new image compressing standard, it has the characteristic of high compression ratio and low distortion.

JPEG2000是一种新的图像压缩标准，具有高压缩率、低失真度和灵活高效的特点。

In order to compute effectively, it is important to comprehend the characteristic of the problem and establish the reasonable model.

为了进行实为有效的计算，理解问题的特性和建立合理的模型是很重要的。

Computer crime appears with the birth and using of computer so it's branded the characteristic of information times.

计算机犯罪是伴随着电子计算机的产生和应用而出现的，带有信息时代的特征。

Based on analyzing characteristic of heat exchange with finite element method, the paper transforms the finite element computing problem into a nonlinear optimizing one with some restriction, and solves it using the Hopfield neural network.

根据热传导有限元分析的特点，把有限元计算问题转化为带约束的非线性优化问题，并给出求解决该问题的改进Hopfield网络，最后对一个简单温度场神经计算进行数值仿真。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。